module Roda::RodaPlugins::MultiRoute::RequestClassMethods

def clear_named_route_regexp!(namespace=nil)

being added while the application is running.
during development it's useful to support new named routes
This shouldn't be an issue in production applications, but

the next time it is needed.
Clear cached regexp for named routes, it will be regenerated 
def clear_named_route_regexp!(namespace=nil)
  @namespaced_route_regexps.delete(namespace)
end

def named_route_regexp(namespace=nil)

A regexp matching any of the current named routes. 
def named_route_regexp(namespace=nil)
  @namespaced_route_regexps[namespace] ||= /(#{Regexp.union(roda_class.named_routes(namespace).select{|s| s.is_a?(String)}.sort.reverse)})/
end